I haven't had a QSO on HF for just over 6 years, so it is unsurprising that I have no contacts to report with it, however as a receiver it is performing very nicely indeed.
My current HF antenna is a Diamond BB6W, slung low at about 12 feet AGL. I have an LDG Z11 Pro ATU nearer to the antenna feedpoint than the rig, so I'm now using it in preference to the internal ATU, which did however tune the antenna to a lower SWR.
Last night I heard VP8NO, in the Falklands Islands on 18.105MHz using 45 baud RTTY. The KX3 decoded it fine and I monitored the traffic using the KX3 utility on Linux. This morning I heard VK4ZD in Australia on 17m on SSB. This receiver is excellent.
I've also got the I/Q output from the KX3 feeding an old Griffin iMic USB soundcard and can monitor 48kHZ of spectrum with gnuradio-companion.
So far, so good :)